Hi, There is an options -ansi to make g++ ANSI compatible. I'm wondering if there is an option to make g++ POSIX compatible. Or g++ is already POSIX compatible without an option? Thanks, Peng
"Peng Yu" <pengyu.ut <at> gmail.com> writes: > There is an options -ansi to make g++ ANSI compatible. I'm wondering > if there is an option to make g++ POSIX compatible. Or g++ is already > POSIX compatible without an option? POSIX itself specifies features macros which you may define to compile your source code in a strict POSIX environment. These are _POSIX_SOURCE and _POSIX_C_SOURCE. These affect the header files rather than the libraries. To get a strict POSIX compiler, use those in conjunction with -ansi or -std. Ian
On Tue, Jul 15, 2008 at 5:57 PM, Ian Lance Taylor <iant <at> google.com> wrote: > "Peng Yu" <pengyu.ut <at> gmail.com> writes: > >> There is an options -ansi to make g++ ANSI compatible. I'm wondering >> if there is an option to make g++ POSIX compatible. Or g++ is already >> POSIX compatible without an option? > > POSIX itself specifies features macros which you may define to compile > your source code in a strict POSIX environment. These are > _POSIX_SOURCE and _POSIX_C_SOURCE. These affect the header files > rather than the libraries. To get a strict POSIX compiler, use those > in conjunction with -ansi or -std. > > Ian >
On Tue, Jul 15, 2008 at 5:57 PM, Ian Lance Taylor <iant <at> google.com> wrote: > "Peng Yu" <pengyu.ut <at> gmail.com> writes: > >> There is an options -ansi to make g++ ANSI compatible. I'm wondering >> if there is an option to make g++ POSIX compatible. Or g++ is already >> POSIX compatible without an option? > > POSIX itself specifies features macros which you may define to compile > your source code in a strict POSIX environment. These are > _POSIX_SOURCE and _POSIX_C_SOURCE. These affect the header files > rather than the libraries. To get a strict POSIX compiler, use those > in conjunction with -ansi or -std. Hi Ian, Isn't ANSI C++ a subset of POSIX C++. Why do I need to specify _POSIX_SOURCE, _POSIX_C_SOURCE and -ansi? Would you please let me know what is the difference between the option -ansi and -std? Thanks, Peng
"Peng Yu" <pengyu.ut <at> gmail.com> writes: I should have said in reply to your last message: this is the wrong mailing list for this question. Please take any followups to gcc-help <at> gcc.gnu.org. Thanks. > Isn't ANSI C++ a subset of POSIX C++. Why do I need to specify > _POSIX_SOURCE, _POSIX_C_SOURCE and -ansi? ANSI C is a subset of POSIX C (as far as I know C++ is not a part of POSIX). Using -ansi restricts you to ANSI C. Adding the POSIX defines tells the library to declare POSIX functions in the POSIX header files. > Would you please let me know what is the difference between the option > -ansi and -std? Please read the fine manual. Ian
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